6533b873fe1ef96bd12d550f

RESEARCH PRODUCT

Synthesis and large scale fractionation of non-linear polymers: brushes and hyperbranched polymers

Axel H. E. MüllerWolfgang SchärtlBernhard A. WolfA. StrackPeter F. W. SimonManfred SchmidtNorbert HugenbergSt Loske

subject

chemistry.chemical_classificationMaterials scienceRadical polymerizationtechnology industry and agriculturePolymerCondensed Matter PhysicsMacromonomerElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryPolymer chemistryMaterials ChemistryCeramics and CompositesSide chainCopolymerPolystyrenePolymer fractionationMethyl methacrylate

description

Polymer brushes with poly(methyl methacrylate) (PMMA) backbone and polystyrene side chains were synthesized by radical polymerization of ω-methacryloyl-polystyrene macromonomers. Hyperbranched PMMA was obtained by means of self-condensing group transfer copolymerization of methyl methacrylate with an initiator-monomer containing a polymerizable methacryloyl moiety and an initiating silylketeneacetal function. Both non-linear products were fractionated using the method of continuous polymer fractionation, consisting in a particular type of continuous countercurrent extraction. The combination of methyl ethyl ketone (solvent) with acetone (AC) (precipitant) turned out to be suitable for the fractionation of the polymer brushes; in case of the hyperbranched material AC served as the solvent component and methanol as the precipitant. The achieved fractionation was checked by means of GPC measurements and in case of the polymer brushes also by AFM, where the differences in the size of the macromolecules became clearly visible.

yearjournalcountryeditionlanguage
2002-09-01Journal of Non-Crystalline Solids
https://doi.org/10.1016/s0022-3093(02)01559-4